EDIT

/**

 * @author k.luther

 * @since 23.03.2018

 */

public class AbcdImportPreference extends CdmPreferencePage implements IE4PreferencePage, SelectionListener {

        }

        this.setApply(true);

       // PreferencesUtil.recursiveSetEnabled(composite, override);

        setApply(true);

                PreferencesUtil.setBooleanValue( PreferencesUtil.prefOverrideKey(PreferencePredicate.AbcdImportConfig.getKey()), override);

            }

            PreferencesUtil.setStringValue(PreferencePredicate.AbcdImportConfig.getKey(), "");

        }

        return true;

    }

    @Override

    public void widgetDefaultSelected(SelectionEvent e) {

        // TODO Auto-generated method stub

                }

                index++;

            }

        }

    }